John, I just want to make this clear: 1. This thread started with post #1 where I didn't mention "Kaspersky" at all and in post #7 you wrote that zone alarm is causing memory leak with "Zone Alarm, Windows Firewall and AVG - Uninstall them (except Windows Firewall) - this is the case of low memory." 2. In post #2 Peter (Parallels) recommended to turn off Windows Firewall and anti virus and to disable Kaspersky. 3. I mentioned in my post #5 that the problem happened only with Service Pack 3, AVG 8 Free Edition, Zone Alarm and Windows Updates (and no Kaspersky) installed. Then "Kaspersky" was only mentioned by me because I just did another test with it on a fresh installed Windows XP. 5. In post #14 we found out that the swap file gets corrupted by Compressor itself - no matter if we install and uninstall Kaspersky or any other Internet Security or anti virus programs and that this a known bug since at least July 2008 so actually we don't need a new thread with detailed explanation for reporting the bug of Paralles Compressor anymore. 6. So there was no need to contact Kaspersky like you have mentioned in post #17. It hasn't been misspelling - it was more likely misreading or misundestanding. The Parallels team had just guided us in the wrong direction to solve the problem here. Best regards.